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Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow. Depending on how you got your copy of Windows 10, activation will use either a digital entitlement or a 25-character product key.

Digital entitlement is a new method of activation in Windows 10 that doesn't require you to enter a product key.

Microsoft has started rolling out Windows 10 Threshold 2 November update. This is the single biggest update coming to Windows 10 and users can get it via normal Windows update.

Microsoft has already released the new ISO image file for Windows 10 Threshold 2 (November Update). Both Windows 10 Threshold 2 32-bit and 64-bit ISO image files can be downloaded from the website Url address link given below.

We recommend all Windows 10 users to download and install Windows 10 Threshold 2 update as soon as possible as it comes loaded with plenty of improvements and new features that will make the PCs more reliable and faster.

With Windows 10 Threshold 2 update, Microsoft has fulfilled the promise to change the Windows 10 activation process and allowed you to use your Windows 7, 8 or 8.1 product keys for activation directly after clean installation.

During the free upgrade, you can use a valid Windows 7, Windows 8, or Windows 8.1 product key to activate Windows 10 (Version 1511 or higher). The following types of product keys are supported:

Product keys included in the packaging or the Certificate of Authenticity (COA) attached to your PC that came installed with Windows.

Product keys included in the confirmation email you received after buying Windows from an online retailer.

Product keys included in the box the Windows DVD came in.

Product keys you bought using Windows Anytime Upgrade or Get Genuine Windows.

If you bought a Windows 8.1 Pro Pack product key, you can use it to activate Windows 10 Pro.

If you activated a free upgrade to Windows 10 or bought and activated Windows 10 from the Windows Store, you have a digital entitlement for your device. This means you can reinstall the same edition of Windows 10 that your device has a digital entitlement for without entering a product key. During reinstallation, if you’re asked to enter a product key, select Skip. Windows 10 will automatically activate online after the installation is complete.

In order to activate Windows 10 with Windows 7, 8 or Windows 8.1 product key, while clean installing Windows 10 skip the part where you need to enter the Windows 10 key.

Windows 10 copy will be installed as an evaluation copy and you’ll be allowed to enter the Windows 7, 8 or 8.1 key for activation.

After Windows 10 is activated, a digital entitlement will be given to your device based on the product key you entered. This means that you’ll no longer need to enter a product key to activate Windows 10 on this device.

On some devices that came pre-installed with Windows 8 or Windows 8.1, the product key is provisioned in the device firmware. On these devices the product key will be verified during setup, and then the appropriate edition of Windows 10 will be installed.